Validate JSON Payloads | Dataford Interview Questions

How would you implement a function to validate if a given string represents a valid JSON payload?

Implement is_valid_json(s) without using a JSON parsing library. Return True only when the complete input is one valid JSON value, followed only by whitespace. Support objects, arrays, strings, numbers, true, false, and null.

Input is a string. Output is a boolean. Reject malformed escape sequences, invalid numbers, missing delimiters, trailing characters, and unescaped control characters. Duplicate object keys are allowed.

Constraints

0 <= len(s) <= 10^4
The input contains ordinary Unicode characters
Nesting depth is at most 100
Whitespace is limited to space, tab, carriage return, and newline
Duplicate object keys are allowed

Function Signature

def is_valid_json(s):

Your question is Validate JSON Payloads. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

How would you implement a function to validate if a given string represents a valid JSON payload?

Constraints

0 <= len(s) <= 10^4
The input contains ordinary Unicode characters
Nesting depth is at most 100
Whitespace is limited to space, tab, carriage return, and newline
Duplicate object keys are allowed

Function Signature

def is_valid_json(s):

Your question is Validate JSON Payloads. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.